EP0312223B1 - A cutting insert and a tool holder therefor - Google Patents

A cutting insert and a tool holder therefor Download PDF

Info

Publication number
EP0312223B1
EP0312223B1 EP88308979A EP88308979A EP0312223B1 EP 0312223 B1 EP0312223 B1 EP 0312223B1 EP 88308979 A EP88308979 A EP 88308979A EP 88308979 A EP88308979 A EP 88308979A EP 0312223 B1 EP0312223 B1 EP 0312223B1
Authority
EP
European Patent Office
Prior art keywords
insert
cutting
cutting insert
metal cutting
tool holder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88308979A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0312223A1 (en
Inventor
Amir Satran
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Iscar Ltd
Original Assignee
Iscar Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Iscar Ltd filed Critical Iscar Ltd
Priority to AT88308979T priority Critical patent/ATE79065T1/de
Publication of EP0312223A1 publication Critical patent/EP0312223A1/en
Application granted granted Critical
Publication of EP0312223B1 publication Critical patent/EP0312223B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/04—Cutting-off tools
    • B23B27/045—Cutting-off tools with chip-breaking arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2205/00—Fixation of cutting inserts in holders
    • B23B2205/02—Fixation using an elastically deformable clamping member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2260/00—Details of constructional elements
    • B23B2260/124—Screws
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/22—Cutters, for shaping including holder having seat for inserted tool
    • Y10T407/2272—Cutters, for shaping including holder having seat for inserted tool with separate means to fasten tool to holder
    • Y10T407/2282—Cutters, for shaping including holder having seat for inserted tool with separate means to fasten tool to holder including tool holding clamp and clamp actuator
    • Y10T407/2286—Resiliently biased clamp jaw
    • Y10T407/2288—Integral with holder
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/23—Cutters, for shaping including tool having plural alternatively usable cutting edges
    • Y10T407/235—Cutters, for shaping including tool having plural alternatively usable cutting edges with integral chip breaker, guide or deflector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/24—Cutters, for shaping with chip breaker, guide or deflector
    • Y10T407/245—Cutters, for shaping with chip breaker, guide or deflector comprising concave surface in cutting face of tool
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/25—Cutters, for shaping including cut off tool

Definitions

  • This invention relates to a cutting insert according to the preamble of claim 1, formed of a hard wear-resistant material such as, for example, a cemented hard metal carbide and intended for use in metal grooving, parting, turning or boring operations.
  • the invention also relates to a tool holder according to the preamble of claim 8.
  • Such inserts are generally of the replaceable kind and are designed to be firmly held in an appropriate receiving seat formed in an insert holder.
  • the insert can be formed with a tapering, wedge-shaped body so as to be wedge clamped within a correspondingly wedge-shaped slot formed in the insert holder.
  • the insert can be clamped between a pair of jaws of the insert holder, which jaws define a receiving slot, the jaws being biased into clamping the insert by suitable mechanical means.
  • Such multidirectional cutting tool inserts are adapted to be held by specially designed tool holders having a pair of gripping jaws formed integral therewith and with each other, the gripping jaws defining between them a receiving slot within which the insert is to be clamped, this receiving slot communicating with an elongated slit formed in the holder and extending longitudinally therein away from the slot.
  • a screw clamping means extends through the tool holder in the region of the slit so that, upon insertion of the insert into the slot, tightening of the screw clamping means results in the uppermost jaw being biased into a tight clamping relationship with the upper surface of the insert.
  • the adjacent surfaces of the insert and the jaws are formed with mating keying surfaces so as to ensure the correct alignment of the insert and so as to prevent its lateral displacement once it is clamped in the tool holder.
  • US-A-3,894,322 discloses a cutting tool with a clamped insert capable of performing turning operations in respectively opposing directions. Seeing that the tool holder and especially the outermost corners thereof have to be capable of withstanding considerable forces during operation, it will be readily appreciated that the fact that the outermost corner defines an acute angle, of necessity implies that the corner is relatively weak and can be subjected to breakage under stress.
  • a metal cutting insert of an elongated substantially prismatic shape and having top and bottom faces and front, rear and a pair of side peripheral faces; a first cutting end of said insert provided with a front cutting edge formed at the intersection of the top face and the front peripheral face and first and second side cutting edges formed respectively at the intersections of said top face and the two side peripheral faces; and chip forming means located on said top face within an area defined by said cutting edges; characterised in that said top and bottom faces are of respectively convex and concave disposition when viewed from a direction facing said side surfaces.
  • convex and concave dispositions include both convexly and concavely arced surfaces as well as surfaces which are formed of a plurality of successive planar components or sectors which together form respectively convex and concave dispositions.
  • a metal cutting tool for use in parting, grooving or turning operations and comprising: a tool holder having upper and lower clamping jaws defining therebetween an insert receiving slot; the upper and lower clamping jaws having respective clamping surfaces such that the clamping surface of the lower jaw defines an angle ⁇ of at least 90° with an adjacent outer edge of the tool holder when viewed from the side of the tool holder characterised in that a metal cutting insert as set forth above is received within said receiving slot.
  • a cutting insert shaped in accordance with the invention facilitates the use of an insert holder having a lower jaw which defines with the adjacent holder edge an angle of at least 90° and in this way the tool holder is substantially strengthened so as to withstand strains exerted thereon during cutting.
  • a multidirectional cutting tool insert 1 (the detailed possible constructions of which will be described below with reference to the remaining Figures), having substantially coaxial, longitudinally directed, upper convex and lower concave surfaces 2a and 2b, is clamped between correspondingly shaped surfaces 3a and 3b of jaws 4 and 5 formed integrally with a tool holder body 6, the surfaces 3a and 3b defining a receiving slot designed to receive the insert 1.
  • This receiving slot communicates with a rearwardly directed slit 7, the provision of which allows for the necessary resilience required for clamping.
  • the insert 1 is firmly clamped within the receiving slot by means of a clamping screw 8 which, when tightened, causes the jaws 4 and 5 clampingly to bear against the corresponding surfaces 2a and 2b of the insert.
  • the surfaces 2a and 2b are respectively formed with longitudinally extending V-shaped faces in which mate corresponding convex V-shaped ribs formed of the corresponding jaw surfaces 3a and 3b.
  • an abutment pin 9 which serves to limit the degree of insertion of the insert 1 into the slot thereby preventing an innermost cutting end of the insert from contacting the end of the slot.
  • the cutting insert consists of a polygonal body with substantially convex and concave top and bottom faces 12a and 12b.
  • the insert furthermore has front and rear peripheral faces 13a and 13b and side peripheral faces 14a and 14b.
  • the top and bottom faces 12a and 12b are formed with longitudinally extending concave keying grooves 15a and 15b of V-shaped cross-section.
  • the insert is formed at diametrically opposite corners thereof with respective cutting ends 16a and 16b which, when the insert 11 is mounted on the insert holder as shown in Fig. 1 of the drawings, are alternately exposed for use.
  • the cutting ends 16a and 16b are of identical construction and one of them (16a) will now be described.
  • first and second side cutting edges 17a and 17b which respectively extend from insert corners 18a and 18b to an intermediate position along the insert 11.
  • a curved front cutting edge 19 which extends between the corners 18a and 18b.
  • the cutting end 16a is furthermore provided with a centrally located chip forming ridge 20 whilst the front peripheral face 13a is formed with a clearance recess 21.
  • the inserts are all formed so as to be slightly wider at their upper faces 12a than at their lower faces 12b. Furthermore, when referring to the upper and lower faces 12a and 12b of the inserts 11 as being respectively convex and concave, it is to be understood that this term applies both when the convexity and concavity are reflected in continuous curved arcs 22 as shown in Figs. 2 and 3 of the drawings, or where the concavity is formed by a succession of planar sectors 23 as shown in Fig. 4 of the drawings.
  • FIGs. 2 through 4 show the insert 11 as being provided with concave keying grooves 15a and 15b, it will be appreciated that the insert could equally well be provided with one or two convex keying ribs which would be adapted to mate within corresponding keying grooves formed in the jaws of the tool holder.
  • Fig. 5 of the drawings shows how the tool holder 6 is formed with jaw surfaces 3a and 3b and, as can be seen in the case of the lower surface 3b, it is formed of planar sectors to conform with the planar sectors forming the concave surface of the insert.
  • the provision of the cutting insert 11 with the curved front cutting edge 19 as well as the provision of the clearnace recess 21 are to ensure that, when the insert 11 is employed for laterally directed turning, the front cutting edge 11 and the front peripheral face 13 makes minimal contact with the workpiece thereby reducing frictional resistance.
  • the jaws 4 and 5 of the tool holder are joined to each other and to the tool holder itself along a line 24 which is directed at an acute angle to a longitudinal axis of the tool holder body 6.
  • the clamping screw 8 is designed to fit into a bore 25 formed with an abutment shoulder 26 which is angularly displaced with respect to the upper surface of the jaw 4. In this way it is ensured that when the clamping screw 8 is tightened it clampingly abuts an upper portion of the shoulder and in consequence the jaw 4 is biased downwardly in the direction of a line 27 so that a jaw tip 28 exerts maximum clamping pressure on the upper surface of the insert 11. In this way it is ensured that the insert 11 is not subjected to laterally directed displacement as a result of the downward clamping of the upper jaw 4.
  • the angle ⁇ may, as shown, be 90°.
  • the angle ⁇ may be any obtuse angle of at least 90°.
  • the lower jaw 5 is provided with an increased resistance to the strains which are normally exerted on it when the tool is used in cutting. This provision of the lower jaw with the obtuse angle is facilitated by the particular shaping of the insert in accordance with the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Milling Processes (AREA)
EP88308979A 1987-10-14 1988-09-28 A cutting insert and a tool holder therefor Expired - Lifetime EP0312223B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88308979T ATE79065T1 (de) 1987-10-14 1988-09-28 Schneideinsatz und werkzeughalter dafuer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL84171 1987-10-14
IL84171A IL84171A (en) 1987-10-14 1987-10-14 Cutting insert and tool holder therefor

Publications (2)

Publication Number Publication Date
EP0312223A1 EP0312223A1 (en) 1989-04-19
EP0312223B1 true EP0312223B1 (en) 1992-08-05

Family

ID=11058240

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88308979A Expired - Lifetime EP0312223B1 (en) 1987-10-14 1988-09-28 A cutting insert and a tool holder therefor

Country Status (13)

Country Link
US (1) US4992007A (ja)
EP (1) EP0312223B1 (ja)
JP (2) JPH01115504A (ja)
AR (1) AR245393A1 (ja)
AT (1) ATE79065T1 (ja)
AU (1) AU607256B2 (ja)
DE (1) DE3873471T2 (ja)
ES (1) ES2034255T3 (ja)
HU (1) HUT49514A (ja)
IL (1) IL84171A (ja)
PL (1) PL154294B1 (ja)
SU (1) SU1720479A3 (ja)
ZA (1) ZA886407B (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9579727B2 (en) 2014-05-28 2017-02-28 Kennametal Inc. Cutting assembly with cutting insert having enhanced coolant delivery
CN108602131A (zh) * 2016-02-15 2018-09-28 伊斯卡有限公司 具有包括向上延伸的脊部的切屑形成装置的走心式车削刀具

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JP4867661B2 (ja) 2006-03-02 2012-02-01 三菱マテリアル株式会社 インサート着脱式切削工具
JP4918799B2 (ja) * 2006-03-24 2012-04-18 三菱マテリアル株式会社 切削インサートのクランプ機構及びインサート着脱式切削工具
JP5028883B2 (ja) 2006-06-30 2012-09-19 三菱マテリアル株式会社 インサート着脱式切削工具
US20080228313A1 (en) * 2007-03-05 2008-09-18 Mori Seiki Usa, Inc. Device and Method for Turning In Virtual Planes
JP5115148B2 (ja) 2007-10-30 2013-01-09 三菱マテリアル株式会社 インサート着脱式切削工具のヘッド部材およびインサート着脱式切削工具
JP5040591B2 (ja) * 2007-10-30 2012-10-03 三菱マテリアル株式会社 インサート着脱式切削工具のヘッド部材およびインサート着脱式切削工具
IL194030A (en) * 2008-09-11 2012-03-29 Iscar Ltd Cutting tool and cutting tool for it
IL203014A (en) * 2009-12-29 2013-03-24 Iscar Ltd Cutting tool and cutting insert therefor
IL205091A (en) * 2010-04-14 2014-01-30 Iscar Ltd Cutting tools and cutting tool for him
KR101175454B1 (ko) * 2010-06-17 2012-08-20 대구텍 유한회사 절삭 인서트 및 이를 장착하기 위한 공구 홀더
KR101825520B1 (ko) 2010-08-04 2018-02-05 세람테크 게엠베하 리세싱 및 그브빙을 위한 절단 공구
DE102011053760A1 (de) * 2011-09-19 2013-03-21 Walter Ag Stechplatte und Klemmhalter mit Vier-Punktanlagen
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US9033622B2 (en) * 2012-01-03 2015-05-19 Iscar, Ltd. Cutting insert having curved ramps for insertion into a tool holder, cutting tool and method of assembly
DE102012004804C5 (de) * 2012-03-09 2019-03-14 Kennametal Inc. Stechschneidplatte sowie Stechschneidwerkzeug
US8905684B2 (en) * 2012-06-22 2014-12-09 Kennametal Inc. Slotting cutter, cutting insert and tool therefor
EP2703104B1 (en) * 2012-08-29 2015-07-08 Sandvik Intellectual Property AB Holder assembly for a cutting tool insert
DE102012111240A1 (de) 2012-11-21 2014-05-22 Hartmetall-Werkzeugfabrik Paul Horn Gmbh Spanabhebendes Werkzeug
CN102921762A (zh) * 2012-11-26 2013-02-13 扬州锦江有色金属有限公司 铅合金棒成丝装置的刀具
CN102962289B (zh) * 2012-11-26 2015-03-25 扬州锦江有色金属有限公司 铅合金棒成丝装置
US9656326B2 (en) * 2013-04-24 2017-05-23 Iscar, Ltd. Tool holder having a clamping member with a non-circular cross-section and method for clamping a cutting insert therein
US20140373697A1 (en) * 2013-06-25 2014-12-25 OTR Recycling Corp. Apparatus for Recycling Tires by Cutting Into Sections
KR102099857B1 (ko) 2013-12-27 2020-04-13 대구텍 유한회사 절삭인서트와 이를 포함하는 절삭공구 조립체
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
US9579727B2 (en) 2014-05-28 2017-02-28 Kennametal Inc. Cutting assembly with cutting insert having enhanced coolant delivery
CN108602131A (zh) * 2016-02-15 2018-09-28 伊斯卡有限公司 具有包括向上延伸的脊部的切屑形成装置的走心式车削刀具
TWI728030B (zh) * 2016-02-15 2021-05-21 以色列商艾斯卡公司 具有包括向上延伸脊的切屑形成配置的走心式車削刀塊

Also Published As

Publication number Publication date
SU1720479A3 (ru) 1992-03-15
AU607256B2 (en) 1991-02-28
JPH01115504A (ja) 1989-05-08
AR245393A1 (es) 1994-01-31
DE3873471D1 (de) 1992-09-10
ES2034255T3 (es) 1993-04-01
EP0312223A1 (en) 1989-04-19
DE3873471T2 (de) 1992-12-03
ZA886407B (en) 1989-05-30
JP2546443Y2 (ja) 1997-09-03
IL84171A (en) 1990-09-17
IL84171A0 (en) 1988-03-31
HUT49514A (en) 1989-10-30
JPH0737504U (ja) 1995-07-11
ATE79065T1 (de) 1992-08-15
PL275262A1 (en) 1989-05-30
AU2168088A (en) 1989-04-20
US4992007A (en) 1991-02-12
PL154294B1 (en) 1991-07-31

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